Electric fan

Abstract

The utility model discloses an electric fan. A motor comprises a rotating shaft; the fixed impeller comprises a fixed impeller body and a protective cover, the fixed impeller body and the protective cover define a containing cavity, the motor is arranged in the containing cavity and is in heat conduction connection with the fixed impeller, the rotating shaft penetrates through the fixed impeller body, and an air outlet is formed in the fixed impeller body; the movable impeller is installed on the rotating shaft and located on the side, away from the motor, of the fixed impeller. The fan cover is fixedly mounted on the fixed impeller and covers the movable impeller, and an air inlet is formed in the fan cover; a first air channel communicating with the air inlet is formed in the movable impeller, a second air channel communicating with the air outlet and the first air channel is formed in the fixed impeller body, and the second air channel is used for guiding all or part of airflow to the outer side wall of the protective cover. According to the electric fan provided by the utility model, the structure of the fixed impeller is optimally designed, so that the motor can be quickly cooled, the motor is prevented from being in an overheating state for a long time, the energy consumption of the motor is prevented from being increased, and the running efficiency of the motor is improved.

Description

Technical Field

[0001] The utility model belongs to the field of electromechanical technology, and in particular relates to an electric fan. Background Art

[0002] A vacuum cleaner is a cleaning appliance that uses a motor to drive the blades to rotate at high speed, creating negative air pressure in a sealed shell, thereby sucking dust and other debris into a dust bag.

[0003] When using a wet / dry vacuum cleaner, a protective cover is added to the outside of the motor to prevent water vapor from entering the motor. This will prevent the heat generated inside the motor from being dissipated smoothly, causing the motor to overheat. In order to solve the problem of motor overheating, existing vacuum cleaners mainly add cooling fans to the top or bottom of the motor. Since the cooling fan is installed on the motor shaft, the operation of the cooling fan will also increase the energy consumption of the motor, thereby reducing the motor's operating efficiency and causing the vacuum cleaner's suction power to decrease.

[0004] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to a person skilled in the art. Utility Model Content

[0005] The utility model aims to provide an electric blower, which can reduce the temperature of the motor, avoid increasing the energy consumption of the motor, improve the operating efficiency of the motor, and enhance the suction power of the vacuum cleaner.

[0006] In order to achieve the above purpose, the technical solution provided by a specific embodiment of the utility model is as follows:

[0007] An electric blower, comprising:

[0008] A motor, wherein the motor comprises a rotating shaft;

[0009] The stator impeller comprises a stator impeller body and a protective cover, wherein the stator impeller body and the protective cover enclose a receiving cavity, the motor is disposed in the receiving cavity and is thermally connected to the stator impeller, the rotating shaft passes through the stator impeller body, and an air outlet is formed on the stator impeller body;

[0010] A moving impeller is mounted on the rotating shaft and is located on a side of the fixed impeller away from the motor;

[0011] An air cover is fixedly mounted on the fixed impeller and covers the movable impeller, and an air inlet is formed on the air cover;

[0012] A first air duct connected to the air inlet is formed in the movable impeller, a second air duct connected to the air outlet is formed in the fixed impeller body, the second air duct is connected to the first air duct, and the second air duct is used to guide all or part of the airflow to the outer wall of the protective cover.

[0013] In one or more embodiments of the present invention, on a plane perpendicular to the rotation axis, the orthographic projection area of ​​the second air duct is located outside the orthographic projection area of ​​the protective cover; and / or,

[0014] The stator impeller is an aluminum stator impeller.

[0015] In one or more embodiments of the present utility model, the fixed impeller body includes a base plate, a first ring body arranged on the surface of the base plate away from the movable impeller, blades spaced circumferentially along the first ring body, and a second ring body sleeved outside the blades. The protective cover is arranged on the surface of the first ring body away from the movable impeller, and the protective cover, the first ring body, and the base plate enclose a receiving cavity.

[0016] In one or more embodiments of the present invention, an abutment platform is provided on the surface of the bottom plate away from the impeller, and the motor abuts against the abutment platform and is thermally connected to the abutment platform.

[0017] In one or more embodiments of the present invention, a heat conducting member is provided between the motor and the abutment platform and / or between the motor and the first ring body and / or between the motor and the protective cover.

[0018] In one or more embodiments of the present invention, the heat conducting member is heat conducting silica gel.

[0019] In one or more embodiments of the present invention, a recessed receiving groove is provided on the abutting platform.

[0020] In one or more embodiments of the present invention, the inner wall of the first ring body is flush with the inner wall of the protective cover, and the wall thickness of the first ring body is greater than the wall thickness of the protective cover; and / or,

[0021] The blades are arranged tilted.

[0022] In one or more embodiments of the present invention, the stator impeller further includes a first reinforcing rib disposed on the inner wall of the protective cover.

[0023] In one or more embodiments of the present invention, the radial dimension of the first reinforcing rib is gradually reduced in whole or in part from the impeller to the stator impeller; and / or,

[0024] The stator impeller further includes a second reinforcing rib disposed on the inner wall of the first annular body, the second reinforcing rib being connected to the first reinforcing rib, and the minimum radial dimension of the second reinforcing rib being greater than or equal to the maximum radial dimension of the first reinforcing rib.

[0025] Compared with the prior art, the utility model has the following beneficial effects:

[0026] The utility model provides an electric blower, which can quickly cool down the motor by optimizing the structure of the stator wheel without adding a cooling fan, thereby preventing the motor from being in an overheated state for a long time, maintaining the motor to run continuously at high power, and prolonging the service life of various parts of the electric blower, thereby avoiding increasing the energy consumption of the motor and improving the operating efficiency of the motor; when the electric blower is applied to a vacuum cleaner, it can not only prevent water vapor from entering the motor, but also improve the suction power of the vacuum cleaner. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 This is a schematic diagram of the top view of the electric blower in one embodiment of the utility model;

[0029] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure at AA in the middle;

[0030] Figure 3 This is a schematic diagram of the top view of the stator impeller in one embodiment of the utility model;

[0031] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure at the middle BB;

[0032] Figure 5 for Figure 2 A magnified view of the local structure at point A. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0034] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0035] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0036] The technical solution of the present utility model will be described below in conjunction with the accompanying drawings.

[0037] Reference Figure 1 , Figure 2 As shown, the electric fan in this embodiment includes: a motor 1, a stator impeller 2, a moving impeller 3, and a fan cover 4.

[0038] Among them, the motor 1 includes a rotating shaft; the stator impeller 2 includes a stator impeller body 21 and a protective cover 22, the stator impeller body 21 and the protective cover 22 enclose a receiving chamber 20, the motor 1 is arranged in the receiving chamber 20 and is thermally connected to the stator impeller 2, the rotating shaft passes through the stator impeller body 21, and an air outlet 210 is formed on the stator impeller body 21; the impeller 3 is installed on the rotating shaft and is located on the side of the stator impeller 2 away from the motor 1; the wind cover 4 is fixedly installed on the stator impeller 2 and is covered on the impeller 3, and an air inlet 41 is formed on the wind cover 4; a first air duct 51 connected to the air inlet 41 is formed in the impeller 3, and a second air duct 52 connected to the air outlet 210 is formed in the stator impeller body 21, the second air duct 52 is connected to the first air duct 51, and the second air duct 52 is used to guide all or part of the airflow to the outer wall of the protective cover 22.

[0039] When the electric fan is working, the impeller 3 rotates around the shaft under the action of the motor 1. Under the action of the impeller 3, the external air flows in from the air inlet 41 and flows through the first air duct 51 and the second air duct 52 successively, and then flows out of the fixed impeller 2 from the air outlet 210. Then, these gases with lower temperatures flow to the outer wall of the protective cover 22 under the guidance of the second air duct 52. In this process, these gases with lower temperatures will first exchange heat with the fixed impeller body 21, and then contact and exchange heat with the protective cover 22, thereby playing a role in cooling the entire fixed impeller 2. Since the fixed impeller 2 and the motor 1 are thermally connected, the fixed impeller 2 after the temperature is reduced can exchange heat with the motor 1 with a higher temperature, taking away the excess heat from the motor 1, so as to keep the motor 1 running continuously at high power, avoid the motor 1 from being in an overheated state for a long time, and improve the service life of various components of the electric fan. Compared with the traditional electric blower, the new electric blower in this embodiment can quickly cool down the motor 1 without adding a cooling fan, thereby avoiding increasing the energy consumption of the motor 1, improving the operating efficiency of the motor 1, and enhancing the suction power of the vacuum cleaner.

[0040] Optionally, the stator impeller 2 in this embodiment is an aluminum stator impeller 2. Aluminum has strong thermal conductivity and low cost, which is conducive to heat exchange between the airflow and the motor 1 through the stator impeller 2.

[0041] In order to allow the airflow out of the second air duct 52 to be guided to the outer wall of the protective cover 22, refer to Figure 1 As shown, on a plane perpendicular to the rotation axis, the orthographic projection area of ​​the second air duct 52 in this embodiment is located outside the orthographic projection area of ​​the protective cover 22 .

[0042] Specifically, in order to guide the gas entering the electric fan through the air inlet 41 under the action of the impeller 3 to the outer wall of the protective cover 22 through the fixed impeller body 21, refer to Figure 3 , Figure 4 As shown, the fixed impeller body 21 in this embodiment includes a bottom plate 211, a first ring body 212 disposed on the surface of the bottom plate 211 away from the impeller 3, blades 213 spaced apart along the circumferential direction of the first ring body 212, and a second ring body 214 sleeved outside the blades 213. The protective cover 22 is disposed on the surface of the first ring body 212 away from the impeller 3. The protective cover 22, the first ring body 212, and the bottom plate 211 enclose a receiving cavity 20. Two adjacent blades 213, the first ring body 212, and the second ring body 214 enclose a second air duct 52. Among them, the blade 213 can be a flat blade 213 or a curved blade 213, which can be understood and accepted by those skilled in the art.

[0043] Further, see Figure 3 , Figure 4As shown, in this embodiment, abutment platform 215 is provided on the surface of the bottom plate 211 away from the impeller 3, and the motor 1 abuts on the abutment platform 215 and is thermally connected to the abutment platform 215. The rotating shaft of the motor 1 passes through the abutment platform 215 and the bottom plate 211 to install the fixed impeller body 21 on the rotating shaft, and the impeller 3 can be installed on the end of the rotating shaft passing through the abutment platform 215 and the bottom plate 211.

[0044] In order to increase the heat conduction connection effect between the stator impeller 2 and the motor 1, so as to facilitate better heat exchange and thus dissipate heat from the motor 1, refer to Figure 5 As shown, a first heat conductor 6 is provided between the motor 1 and the abutment platform 215 in this embodiment. According to this design, the heat exchange effect between the motor 1 and the abutment platform 215 can be enhanced by the first heat conductor 6. Of course, the present application is not limited to this. In another embodiment, a second heat conductor (not shown) is provided between the side wall of the motor 1 and the inner wall of the first ring body 212. Preferably, in other embodiments, a third heat conductor (not shown) is provided between the side wall of the motor 1 and the inner wall of the protective cover 22. Among them, the first heat conductor 6, the second heat conductor, and the third heat conductor can be made of the same or different materials. The heat exchange effect between the motor 1 and the stator 2 can be enhanced by the first heat conductor 6, the second heat conductor, and the third heat conductor.

[0045] Exemplarily, in order to enhance the heat exchange between the abutment platform 215 and the motor 1, the first heat-conducting member 6 in this embodiment is a thermally conductive silicone. Furthermore, the thermally conductive silicone can be selected from Kraft K-5203K thermally conductive silicone, which has a thermal conductivity of 1.2 and has strong thermal conductivity, which is conducive to reducing the temperature of the motor 1 through the stator impeller body 21 with a lower temperature. Of course, the present application is not limited to this. In other embodiments, the first heat-conducting member 6 can also be heat dissipation paste, or thermally conductive silicone grease, or silicone sheet, etc. When the electric fan is also provided with a second heat-conducting member or a third heat-conducting member, the second heat-conducting member or the third heat-conducting member can also be thermally conductive silicone, or heat dissipation paste, or thermally conductive silicone grease, or silicone sheet, etc., which will not be repeated here.

[0046] Preferably, refer to Figure 4 As shown, the abutment platform 215 in this embodiment is provided with a recessed receiving groove 2151. According to this design, when a fluid-like heat-conducting member such as heat-conducting silica gel, heat-dissipating paste, or heat-conducting silicone grease is selected, part of the heat-conducting member can be received in the receiving groove 2151, thereby increasing the volume of the heat-conducting member, so that the stator impeller 2 can better exchange heat with the motor 1 through the heat-conducting member.

[0047] Specifically, refer to Figure 2 , Figure 4As shown, the inner wall of the first ring body 212 in this embodiment is flush with the inner wall of the protective cover 22, and the wall thickness of the first ring body 212 is greater than the wall thickness of the protective cover 22. It should be noted that since the second air duct 52 needs to guide the airflow to the outer wall of the protective cover 22, the second air duct 52 needs to guide the airflow to gradually spiral inward, and the blades 23 are inclined. According to this design, after the airflow flows out of the second air duct 52, it will flow upward and gradually inward for a distance and then collide with the outer wall of the protective cover 22, thereby exchanging heat with the protective cover 22. According to this design, the contact area between the airflow and the outer wall of the protective cover 22 is larger, which can facilitate better and faster heat exchange with the protective cover 22.

[0048] When the stator impeller 2 is die-cast, in order to prevent the structure of the stator impeller 2 from changing, refer to Figure 4 As shown, the stator impeller 2 in this embodiment further includes a first reinforcing rib 221 disposed on the inner wall of the protective cover 22. According to this design, the structural strength of the protective cover 22 can be enhanced to prevent the protective cover 22 from being deformed.

[0049] Optionally, the radial dimension of the first reinforcing rib 221 in this embodiment is gradually reduced in whole or in part from the impeller 3 to the stator impeller 2. Figure 4 As shown, the first reinforcing rib 221 in this embodiment includes a first main body 2211 with a constant radial size and a second main body 2212 that gradually decreases in the direction from the automatic impeller 3 to the fixed impeller 2, the first main body 2211 is close to the movable impeller 3, and the second main body 2212 is far away from the movable impeller 3. It can be understood that since the first reinforcing rib 221 is located in the receiving cavity 20, when the structure of the second main body 2212 is as described above, it is convenient to install the motor 1, and at the same time, during the process of drawing and forming the protective cover 22, it can be prevented from being damaged, and the excellent rate of the fixed impeller 2 is high.

[0050] Furthermore, in order to further enhance the structural strength of the stator impeller body 21 and avoid structural deformation of the stator impeller body 21 during the die casting process, Figure 4 As shown, the stator impeller 2 in this embodiment also includes a second reinforcing rib 2121 arranged on the inner wall of the first ring body 212, the second reinforcing rib 2121 is connected to the first reinforcing rib 221, and the minimum radial dimension of the second reinforcing rib 2121 is greater than or equal to the maximum radial dimension of the first reinforcing rib 221.

[0051] It can be seen from the above technical solutions that the utility model has the following beneficial effects:

[0052] The utility model provides an electric blower, which can quickly cool down the motor by optimizing the structure of the stator wheel without adding a cooling fan, thereby preventing the motor from being in an overheated state for a long time, maintaining the motor to run continuously at high power, and prolonging the service life of various parts of the electric blower, thereby avoiding increasing the energy consumption of the motor and improving the operating efficiency of the motor; when the electric blower is applied to a vacuum cleaner, it can not only prevent water vapor from entering the motor, but also improve the suction power of the vacuum cleaner.

[0053] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0054] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An electric fan, characterized in that: The electric fan comprises: A motor, wherein the motor comprises a rotating shaft; The stator impeller comprises a stator impeller body and a protective cover, wherein the stator impeller body and the protective cover enclose a receiving cavity, the motor is disposed in the receiving cavity and is thermally connected to the stator impeller, the rotating shaft passes through the stator impeller body, and an air outlet is formed on the stator impeller body; A moving impeller is mounted on the rotating shaft and is located on a side of the fixed impeller away from the motor; An air cover is fixedly mounted on the fixed impeller and covers the movable impeller, and an air inlet is formed on the air cover; A first air duct connected to the air inlet is formed in the movable impeller, a second air duct connected to the air outlet is formed in the fixed impeller body, the second air duct is connected to the first air duct, and the second air duct is used to guide all or part of the airflow to the outer wall of the protective cover.

2. The electric blower according to claim 1, characterized in that: On a plane perpendicular to the rotation axis, an orthographic projection area of ​​the second air duct is located outside an orthographic projection area of ​​the protective cover; and / or, The stator impeller is an aluminum stator impeller.

3. The electric blower according to claim 1, characterized in that: The fixed impeller body includes a base plate, a first ring body arranged on the surface of the base plate away from the impeller, blades spaced circumferentially along the first ring body, and a second ring body sleeved outside the blades. The protective cover is arranged on the surface of the first ring body away from the impeller. The protective cover, the first ring body and the base plate enclose a receiving cavity.

4. The electric blower according to claim 3, characterized in that: An abutment platform is provided on the surface of the bottom plate away from the impeller, and the motor abuts on the abutment platform and is thermally connected to the abutment platform.

5. The electric blower according to claim 4, characterized in that: A heat conducting member is provided between the motor and the abutment platform and / or between the motor and the first ring body and / or between the motor and the protective cover.

6. The electric blower according to claim 5, characterized in that: The heat conducting member is heat conducting silica gel.

7. The electric blower according to claim 4, characterized in that: The abutting platform is provided with a concave receiving groove.

8. The electric blower according to claim 3, characterized in that: The inner wall of the first ring body is flush with the inner wall of the protective cover, and the wall thickness of the first ring body is greater than the wall thickness of the protective cover; and / or, The blades are arranged tilted.

9. The electric blower according to claim 8, characterized in that: The stator impeller further includes a first reinforcing rib arranged on the inner wall of the protective cover.

10. The electric blower according to claim 9, characterized in that: The radial dimension of the first reinforcing rib is gradually reduced in whole or in part from the impeller to the stator impeller; and / or, The stator impeller further includes a second reinforcing rib disposed on the inner wall of the first annular body, the second reinforcing rib being connected to the first reinforcing rib, and the minimum radial dimension of the second reinforcing rib being greater than or equal to the maximum radial dimension of the first reinforcing rib.

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